I heard (can't remember who told me) the black stones are old stones that have been sitting in the liver for a longer time. The green ones are much more recent.
I have done 3 flushes up to now. The first 2 I had no result at all. The last one in which i took more oil then prescribed even I had exactly 4 little pea size stones green in color.
I have been vegetarian since childhood en vegan since I was 17 (I am 37 now). i have very low cholesterol. I did the Liver Cleanses because of pressure at my right side. i found the flushes not working much.
I found that fresh juice of green leaves mixed with apple takes the pressure off completely and makes my complexion radiant. So I think that is the way to go for me. Green juices also seem to detoxify the liver. I am loving my new freshly juiced mix of apple juice and mint (or any other kind of green leafy veggie) and now I am adding a teaspoon of olive oil to make it a perfect little flushy drink for every morning and evening. the added olive oil makes it really creamy and yummie This drink has taken away any pressure I had on the right side. I have the drink at breakfast and before sleep om empty stomach and I am feeling just great. The rest of the day I eat and drink mostly fresh fruit(juice) and very light digestable food like quinoa and amarantz. Never felt better in my life!